The Phoenix Zoo offers everything essential for a family outing: interesting things to look at, including more than 200 endangered or threatened mammals, birds and reptiles; refreshments; and lots of space for kids to run around and enjoy themselves. If you buy an annual membership, you get discounts year-round. An annual membership for a family of two adults and two children (ages 3-18) goes for about $100, the price of going to the zoo a couple of times and paying general admission. Plus, with the pass, you get two free admission tickets.